PROTECTION AGAINST MARINE CORROSION OF ALUMINIUM ALLOY A6061: EIS AND SEM-EDS APPROACHES

Seawater is inherently chemically aggressive. Marine structural material used in seawater handling is subjected to varying degree of corrosion depending upon nature and operational conditions. A study was undertaken to investigate the effect of seawater on aluminium corrosion. Natural honey has been evaluated as a corrosion inhibitor for aluminium alloy in seawater by electrochemical measurement and surface morphology examination. The effect of natural honey on the charge transfer resistant is measured at various concentrations. EIS studies showed that there was significant increase in overall resistant after addition of natural honey. The inhibition efficiency increases with increase in inhibitor concentration. The nature of adsorption of natural honey on the metal surface has also been examination. The analysis of SEM and EDS confirmed formation of precipitates of natural honey on the metal surface, which reduced the overall corrosion reaction.